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From "Kihwal Lee (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7964) Deadlock in class init.
Date Sat, 07 Jan 2012 00:13:39 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181718#comment-13181718
] 

Kihwal Lee commented on HADOOP-7964:
------------------------------------

The following is partial stack trace of the hung dfs put.

{noformat}
Full thread dump Java HotSpot(TM) Server VM (17.0-b16 mixed mode):

"TGT Renewer for xxx@XXXXXX" daemon prio=10 tid=0x08263c00 nid=0x71f6 in Object.wait()
[0xe6b9a000]
   java.lang.Thread.State: RUNNABLE
        at org.apache.hadoop.security.SecurityUtil.setTokenServiceUseIp(SecurityUtil.java:71)
        at org.apache.hadoop.security.SecurityUtil.<clinit>(SecurityUtil.java:62)
        at org.apache.hadoop.security.UserGroupInformation.getTGT(UserGroupInformation.java:528)
        - locked <0xf283f1e0> (a org.apache.hadoop.security.UserGroupInformation)
        at org.apache.hadoop.security.UserGroupInformation.access$800(UserGroupInformation.java:77)
        at org.apache.hadoop.security.UserGroupInformation$1.run(UserGroupInformation.java:555)
        at java.lang.Thread.run(Thread.java:619)

"main" prio=10 tid=0x08066c00 nid=0x71e4 in Object.wait() [0xf7440000]
   java.lang.Thread.State: RUNNABLE
        at org.apache.hadoop.net.NetUtils.<clinit>(NetUtils.java:80)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:174)
        at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:109)
        at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2032)
        at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:78)
        at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2066)
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2048)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:284)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:151)
        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:268)
        at org.apache.hadoop.fs.Path.getFileSystem(Path.java:190)
        at org.apache.hadoop.fs.shell.PathData.expandAsGlob(PathData.java:262)
        at org.apache.hadoop.fs.shell.CommandWithDestination.getRemoteDestination(CommandWithDestination.java:80)
        at org.apache.hadoop.fs.shell.CopyCommands$Put.processOptions(CopyCommands.java:164)
        at org.apache.hadoop.fs.shell.Command.run(Command.java:153)
        at org.apache.hadoop.fs.FsShell.run(FsShell.java:254)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:69)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:83)
        at org.apache.hadoop.fs.FsShell.main(FsShell.java:296)
{noformat} 

We haven't seen this in 0.20.205, which has the same stuff. Maybe it doesn't happen or happens
rarely because of timing differences.
                
> Deadlock in class init.
> -----------------------
>
>                 Key: HADOOP-7964
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7964
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security, util
>    Affects Versions: 0.20.205.0, 0.24.0, 0.23.1, 1.0.0, 1.1.0
>            Reporter: Kihwal Lee
>            Priority: Blocker
>
> After HADOOP-7808, client-side commands hang occasionally. There are cyclic dependencies
in NetUtils and SecurityUtil class initialization. Upon initial look at the stack trace, two
threads deadlock when they hit the either of class init the same time.

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